Apparatus for electrical perforation of webs

Details Apparatus for electrical perforation of webs Apparatus for electrical perforation of webs

1978-06-30

1980-11-25

Mayewsky, Volodymyr Y.

Electric heating

Heating devices

Electric arc-type devices

131 15B, 162286, 219121EB, 219383, H05B 718

Patent

active

042360625

ABSTRACT:
A web is electrically perforated at high hole density by applying alternating-current voltage across an electrode pair facing the web while pressurized gas is supplied to the electrode gap. Voltage amplitude level and gas flow and direction thereof are selected to provide for the striking of multiple arcs per half-cycle, thereby enabling reduction in spacing between adjacent perforations in the web. Perforation practice involving preselection of cigarette filter tipping paper based on chemical composition of the paper is also disclosed as is apparatus for use in implementing the described practices, wherein electrode support members have gas flow conduits formed integrally therewith and wherein webs are taken up by a capstan drive unit resiliently biased into engagement with a web take-up roll.

REFERENCES:
patent: 2372508 (1945-03-01), Meaker
patent: 2763759 (1956-09-01), Mito et al.
patent: 2982186 (1961-05-01), McKeen
patent: 3098143 (1963-07-01), Warmt
patent: 3351740 (1967-11-01), Heuer
patent: 3412636 (1968-11-01), Sciff
patent: 3862396 (1975-01-01), Machida et al.
patent: 3891828 (1975-06-01), De Corso

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